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OURA

Oura Ring 4 - Black - Size 5 - Smart Ring - Size First with Oura Ring 4 Sizing Kit - Sleep Tracking Wearable - Heart Rate - Fitness Tracker - Up to 8 Days of Battery Life

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Availability: In Stock.
Fulfilled by Amazon
Arrives Thursday, Aug 14
Order within 17 hours and 3 minutes
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Color: Black


Size: 5


Features

  • SIZE BEFORE YOU BUY - Oura Ring 4 sizes are different from standard ring sizes. Size yourself with the Oura Ring 4 Sizing Kit. For additional details, see From the brand section below
  • OURA MEMBERSHIP - First month of membership is included with purchase, for new members only. Subscription is 5.99/mo afterwards. Or opt for the annual prepaid option for 69.99. Membership is tied to your account via the Oura App, not your physical ring
  • ACCURACY - SMART SENSING - Oura tracks over 30 biometrics, including sleep, activity, stress, heart health, and womens health metrics. Oura Ring 4 is powered by Smart Sensing, which adapts to you delivering accurate, continuous data, day and night
  • LONG LASTING BATTERY - With up to 8 days of battery life, no screens and no vibrations, Oura Ring 4 allows you to focus on the present. From a workout to a night out youre free to forget its on. Until you start getting compliments
  • DESIGNED FOR 24/7 WEAR - The updated design of the Oura Ring 4 is more comfortable, fits better than ever, and is water resistant. The first all-titanium smart ring combines exceptional durability with a gentle touch, even for sensitive skin
  • SYNC WITH YOUR FAVORITE APPS - Compatible with iOS and Android Oura seamlessly integrates with over 40 apps including Apple Health, Google Health Connect, Natural Cycles, Flo, Strava, & more
  • HSA/FSA ELIGIBLE - We can accept HSA or FSA funds for the following: Oura Ring, Oura Ring Chargers
  • LOOKING FOR THE BEST HEALTH TRACKER? - Whether youre searching for a sleep ring or fitness ring, Oura Ring 4 is for you this revolutionary smart ring that allows you to discreetly track your sleep, activity, recovery and stress in style

Description

Introducing Oura Ring 4: the latest evolution of the revolutionary smart ring. Oura Ring 4 brings you closer to what matters most — your health. The updated all-titanium design is powered by Smart Sensing, a new sensing platform that doesn’t just measure your biometrics, it adapts to you, providing insights into over 30 biometrics including sleep, readiness, activity, heart health, stress, metabolic health and women’s health. Oura Ring 4 quietly and comfortably monitors your health and with up to 8 days of battery life — you can forget it’s even on. Sleeker, smarter and more accurate than ever, Oura Ring 4 is made for you. Oura Ring 4 is FSA/HSA Eligible — we can accept FSA or HSA funds for the following: Oura Ring 4, additional chargers, and shipping. IMPORTANT: Size yourself with the Oura Ring 4 Sizing Kit before you buy — Oura Ring 4 is not US standard sizing, and finding the right size will result in the best experience possible. With an Oura Ring 4 Sizing Kit purchase, a credit will automatically be applied to your Oura Ring 4 at checkout.

Product Dimensions: 0.91 x 0.91 x 0.28 inches


Item Weight: 6.7 ounces


Item model number: JZ90-54144-05


Batteries: 1 Lithium Polymer batteries required. (included)


Connectivity technologies: Bluetooth


Other display features: Wireless


Human Interface Input: Unknown


Color: Black


Whats in the box: Oura Ring 4, Oura Ring 4 Charger, USB Cable, Information Booklet, Quick Start Guide


Manufacturer: Oura


Country of Origin: Estonia


Date First Available: October 3, 2024


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Aug 14

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
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  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

    • Oura is terrific!
Color: Stealth Size: 7
Oura is just what I’ve been looking for in a fitness device—and a lot more. Have been frustrated with previous fitness bands, not very accurate, tiny screens, and need to remove whenever around water. I wasn’t looking for a device that beeps, buzzes, notifies me of calls, emails, etc. Just wanted a reliable , easy to use accurate one. Oura provides tons of data, including basic vitals, steps, detailed sleep analysis , stress levels, and lots of suggestions on how to improve health. It’s waterproof, so I never have to take it off to shower or do dishes. It’s comfortable to wear, and all the data is only available to view on your cell phone, where it’s easy to read. I haven’t yet tried all the great features, including calorie counting. So much to see and learn. I have to charge it about every 4-5 days, not a week as advertised. Charging is fast and easy. Highly recommend! ... show more
Reviewed in the United States on June 7, 2025 by Mary G
    • Stylish, Insightful, and Surprisingly Comfortable — Love Everything About It
Color: Rose Gold Size: 11
I’ve been wearing the Oura Ring Gen 4 in rose gold for several weeks now, and I genuinely love everything about it. It’s rare to find a health and wellness device that looks good — but this ring really nails it. The design is sleek and minimal, and the rose gold finish adds just the right amount of style without being flashy. It is thicker than your average accessory ring - but, it goes with everything, and I love that I can wear it 24/7 without it looking like a fitness tracker. I don't like the bulkiness of other devices so this is perfect. Comfort-wise, I barely notice it’s on — even while sleeping, which is impressive. The data it provides is clear, comprehensive, and genuinely helpful. I’ve learned so much about my sleep patterns, stress, recovery, and overall activity. The Oura app does a great job of translating data into simple, actionable insights without overwhelming you. Battery life is solid (I charge it every few days), and the charging process is quick and easy. I also appreciate the emphasis on recovery and readiness — it’s a more balanced and holistic approach than many fitness trackers I’ve used in the past. If you want a stylish, low-profile device that delivers high-quality health and wellness tracking, the Oura Ring Gen 4 is absolutely worth it. ... show more
Reviewed in the United States on May 20, 2025 by KC
    • One month in! It's great!
Color: Stealth Size: 9
I've been wearing the oura ring gen 4, stealth, size 9 for exactly one month now. First off, sizing. I was between sizes 9 and 10. I opted for the smaller size using this little test: Using the plastic ring sizes, if you cannot take off the ring in the morning when your fingers are puffiest, and the only way to do so is by wetting your finger to add some slippage, then that's the right size. With the bigger size, I was able to take off the ring in the morning without using water so I felt that size was too big. One month later, I am glad I went with the smaller size. No discomfort and still using water in the morning to take off the ring before I shower. Comfort I wear it on my right index finger. I did not like in between fingers, which is the reason I wear a silicone wedding band. But overall, it's not very intrusive. It's annoying to write with a pen or pencil but that's not often. Appearance I love the stealth color. Already got a few scratches on my palm side, which is a little annoying. But I tell myself that at least the back of my hand, the ring looks like new. I use these silicone protectors when working out with weight and it does a great job. The scratches came from handling things where I should have taken off my ring. I wish there were some way to make the scratches less visible as these scratches you see a shiny silver metal which contrasts a lot! Battery No issues. I charge it every few days or so while I shower. I am manually trying to keep the battery at between 25% and 75% but most often I forget that I left it charging and it goes back to 100%. Sleep Tracking I'm not a power user. I enjoy checking in the morning my sleep score and compare it to how I thought my sleep went the night prior. Pretty accurate sleep tracking in my opinion. Fitness Tracking. So we all know that the step counter is way off so I don't really care about that. However, the ring really is good at spotting fitness "events" and I love that when opening the app, there's a backlog of events that you have to confirm the type of activity. My top three are: housework, walking, and HIIT. The app gets better at recognizing the events so most times I am just confirming instead of categorizing. Overall, this level of tracking is simply encouraging me to be more active, which has lead to a good impact on my health. Overall, pretty satisfied with the ring. Glad I got it. ... show more
Reviewed in the United States on February 19, 2025 by Nicole R.

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